[Bug 1640457] Re: Xorg assert failure: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed.

[Daniel van Vugt]

The crash is occurring in libdrm_nouveau.so.2 which comes from source
package `libdrm'. So it seems to be just a nouveau driver crash and not
a general Xorg issue.

** Information type changed from Private to Public

** Package changed: xorg-server (Ubuntu) => libdrm (Ubuntu)

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Title:
  Xorg assert failure: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel:
  Assertion `bkref' failed.

Status in libdrm package in Ubuntu:
  New

Bug description:
  I have three options for my video adapter: nvidia-304 (+ nvidia-
  opencl-icd-304 and nvidia-settings) and xserver-xorg-video-nouveau. If
  I uninstall both of them (I was forced to do that because xserver-
  xorg-video-nouveau doesn't work at all and nvidia-304 doesn't work at
  latest version), system seems to work, but periodically (5 minutes to
  1 hour) XOrg crashes.

  Crashes seem to occur at random points of time (unrelated to my
  actions), but persistently.

  1) lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

  2) apt-cache policy xorg xserver-xorg-core
  xorg:
    Installed: 1:7.7+13ubuntu3
    Candidate: 1:7.7+13ubuntu3
    Version table:
   *** 1:7.7+13ubuntu3 500
          500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  xserver-xorg-core:
    Installed: 2:1.18.4-0ubuntu0.1
    Candidate: 2:1.18.4-0ubuntu0.1
    Version table:
   *** 2:1.18.4-0ubuntu0.1 500
          500 http://ua.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2:1.18.3-1ubuntu2 500
          500 http://ua.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  3) I expected XOrg to run stably (or not to run at all if some
  critical components are missing).

  4) It crashes every 5min-1hour.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-core 2:1.18.4-0ubuntu0.1
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AssertionMessage: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed.
  Date: Wed Nov  9 13:20:43 2016
  ExecutablePath: /usr/lib/xorg/Xorg
  ExecutableTimestamp: 1473867446
  InstallationDate: Installed on 2015-11-10 (364 days ago)
  InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151110)
  ProcCmdline: /usr/lib/xorg/Xorg -nolisten tcp -auth /var/run/sddm/{0f1dcf2c-924d-493a-b72a-0d3865f108e8} -background none -noreset -displayfd 17 vt7
  ProcCwd: /
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __assert_fail_base (fmt=<optimized out>, assertion=assertion at entry=0x7fd94a537728 "bkref", file=file at entry=0x7fd94a53770a "../../nouveau/pushbuf.c", line=line at entry=238, function=function at entry=0x7fd94a537768 "pushbuf_krel") at assert.c:92
   __GI___assert_fail (assertion=0x7fd94a537728 "bkref", file=0x7fd94a53770a "../../nouveau/pushbuf.c", line=238, function=0x7fd94a537768 "pushbuf_krel") at assert.c:101
   ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
   nouveau_pushbuf_reloc () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
  Title: Xorg assert failure: Xorg: ../../nouveau/pushbuf.c:238: pushbuf_krel: Assertion `bkref' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
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